Invalid JSON prompt

I just spent forever working on this custom shape with Physics Editor and GS does not accept it. getting invalid json prompt. anyone have any idea what could be wrong?? I really need this to work because the sprites that GS creates are a bit too large to size down to make invisible walls. the image is 1920x1080.

@sinbot Can you post the JSON code here? I remember the export script for exporting from PES by default does not handle multi-polygonal collisions correctly, but it can be modified to do so. Here is an example below:

However for it to be 100% correct you'd want to use this script but remove the last comma on the end block since no further collisions blocks occur. There is probably a better way to write this. Maybe someone can take a look.